Green Plains Otter Tail, LLC v. Pro-Environmental, Inc.

Background

Green Plains owns and operates an ethanol production facility in Fergus Falls, Minnesota. The facility used a regenerative thermal oxidizer to process ethanol co-product. Pro-Environmental designed, manufactured, distributed, and/or sold the oxidizer and related equipment.

The equipment used a hydraulic power unit to operate dampers that were supposed to move to safe positions during an emergency. A hydraulic accumulator served as a backup source of power if the main power unit failed. On March 10, 2014, a coupling in the hydraulic unit failed, causing a loss of pressure. The dampers did not move to their intended safe positions, and a fire and explosion occurred in the dryer. An inspection found that the accumulator had no remaining pre-charge pressure.

Green Plains asserted negligence and strict-products-liability claims based on alleged design defects and failure to warn. Pro-Environmental moved for summary judgment.

Design-defect claims

Under Minnesota law, the court treated Green Plains’ negligence and strict-liability design-defect theories as one products-liability theory. Green Plains argued that the equipment should have included different safety features, such as a backup pump or motor, alternative power sources, more specific pressure monitoring, a different alarm setting, additional accumulator capacity, or a hazard and operability study.

The court held that the existence of alternative designs did not by itself establish a defect. It found that the equipment conformed to industry standards, that using a single pump was standard, and that the system included an accumulator capable of moving the dampers if properly charged. The court also found no evidence that the equipment model was prone to catastrophic failure or that a larger accumulator would have prevented the accident.

The court further held that Green Plains’ lack of maintenance was a superseding cause—a later event that breaks the legal connection between an earlier alleged defect and the injury. The court found that Green Plains had not checked or maintained the accumulator and that proper maintenance would have revealed the relevant problems. It concluded that Green Plains’ lack of maintenance was the sole cause of the fire and explosion, and that the alleged design defects were not the proximate cause. The court therefore granted summary judgment to Pro-Environmental on the negligent and strict-products-liability design-defect claims.

Failure-to-warn claims

The court treated Green Plains’ negligence and strict-liability failure-to-warn theories as one claim. Green Plains argued that Pro-Environmental’s instructions did not adequately explain the accumulator’s safety function or the consequences of failing to maintain it.

The court found that the manuals warned that periodic cleaning and maintenance were required and that failure to perform them could create fire, explosion, or other hazards. The manuals also instructed users to inspect and maintain the hydraulic system and to check the accumulator during commissioning and monthly afterward.

The court held that the warnings were sufficient. It also held that, even if the warnings had been inadequate, Green Plains had not shown a causal connection because the record did not establish that its employees actually read them. The court granted summary judgment to Pro-Environmental on the failure-to-warn claims.

Disposition

The order granted Pro-Environmental’s motion for summary judgment and dismissed Green Plains’ complaint with prejudice. Judge Donovan W. Frank directed that judgment be entered.